Walking with Superman: Day 343

Clark Kent is on a tour of Wright, Wyoming's Black Thunder Coal Mine, one of the largest such mines in the world. It's a fairly standard and informative trip, until a coal silo is suddenly buried beneath a mountain of stone and dust! Now Clark and the rest of the tour group are trapped inside with a limited amount of air, and perhaps even less time before the ceiling collapses on top of them! Even if Clark can find a way to rescue the trapped tourists without revealing his secret identity, he still has to discover what caused the accident--if it was an accident--and prevent it from happening again!